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Tesseract Guitar Practice Amp

2 years ago  

License: CC-BY-NC-SA 3.0

Status: Complete

Audio relatedGuitar AmpLM386DIYLM386 DIY guitar ampGuitar Practice AmpEasy LM386 ampLM386 youtube
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The EasyEDA "Tesseract" DIY Guitar Practice Amplifier is an LM386 based low power amplifier designed to deliver up to about 500mW into an
8 Ohm speaker when run from a 9V battery.

Tesseract can be heard on YouTube here:

https://youtu.be/9XzodyefyV8

The design given here - which includes a complete PCB design and Bill of Materials - is highly flexible and allows the several options in both the build and use of the amplifier.

As well as a clipping circuit that some other designs - such as the more well known Smokey, Little Gem, Ruby and Noisy Cricket - have incorporated, Tesseract has several unique effects features designed into it:

  • Selectable Bipolar or Junction FET input stage for different input overload effects;
  • Adjustable gain and clipping 'hardness' in the Distortion stage;
  • An adjustable fullwave rectifier stage, driven by the distortion output, that generates a type of fuzz and frequency doubling effect called 'Wreckage';
  • An optional low frequency oscillator stage to sweep the Wreckage effect;
  • A simple mixer to blend the 'Wrecked' and the 'Distortion' outputs;
  • Selectable, adjustable low or high frequency boost (a type of tone control);

  • An important aspect of the design is that all the features and FX can be tweaked for your delight and delectation.
  • Most features are also optional and can be wire linked out if not required without affecting the other functions.
  • The design could easily be modified to suit the LM380 2.5W or LM384 5W amplifier chips (although the Boost function would have to be omitted) or a range of other devices.

  • The design also includes a headphone output jack.
  • The PCB includes dual footprinting to simplify the choice of some of the components.
  • All parts (excluding the PCB) are available from: http://www.bitsbox.co.uk/
    (Bitsbox can also supply suitable small switches, loudspeakers and battery holders or clips.)
    An alternative for J1 as an MPF102 is available from: http://www.tandyonline.co.uk/components/semiconductors/transistors/mpf102-jfet.html

  • Simulations of the different stages of this amplifier - and a copy of the EasyEDA LM386EE spice model used in them - can be found here:

https://easyeda.com/example/Tesseract_Guitar_Practice_Amp_simulation_files-H0ca8IFDB

To order Tesseract PCBs direct from EasyEDA

Sign up for a free account at:

https://EasyEDA.com

then click on 'Fork' or 'Open in Editor' in the upper right of this page and then click on the Fabrication Output... button on the top toolbar of the PCB layout tab:

Fabrication Output...

Then click on the Save To Cart button on the Add To Cart page:

Save To Cart

Then follow the instructions on the

Home > My Account> Cart

page.

Orders can be tracked on the

Home > My Account> History Orders

page.

To download Gerbers for 3rd party PCB fabrication

Click on 'Open in Editor' in the upper right of this page and then click on the Fabrication Output... button on the top toolbar of the PCB layout tab:

Fabrication Output...

Then click on the Download Gerber Files button on the Add To Cart page:

enter image description here

  • Please note that this project is subject to the CC-BY-NC-SA 3.0 license. For more information please see:

https://creativecommons.org/licenses/by-nc-sa/3.0/

Tesseract Guitar Practice Amp Schematic

Tesseract Guitar Practice Amp Schematic

Tesseract Guitar Practice Amp PCB

Tesseract Guitar Practice Amp PCB

Attachments

FilenameDownload
Tesseract_front_view.JPGDownload
bare_pcb_solder_side.JPG.JPGDownload
Tesseract_back_view.JPGDownload
DSC05051.JPGDownload
Tesseract_top_view.JPGDownload

BOM

IDValueQty.PackageComponentsManufacturer PartBitsbox Order CodeDescription
110k7RC07R15,R14,R2,R7,R26,R24,R1VariousMR2510K10k 250mW Metal Film 2% or better.
251k8RC07R12,R4,R5,R8,R27,R31,R21,R11VariousMR25100K100k 250mW Metal Film 2% or better.
3100p1C_MLCC_RES_DIP_5.5x3mm_P5mmC9VariousNPO100P100pF 16V ceramic capacitor. 5mm pitch resin dipped MLCC or similar.
42N54581TO-92J12N5458QD0712N5458 N channel JFET in TO-92 package.
5BC5477BC547Q1,Q2,Q3,Q4,Q5,Q6,Q7BC547BQD011BC547 NPN BJT in TO-92 package.
61Meg7RC07R3,R17,R16,R32,R36,R37,R19VariousMR251M1M 250mW Metal Film 2% or better.
71Meg_LOG2POT_BITech-TTE_P160KNRV2,RV1VariousVR0451M Log pot. PCB mount like: http://www.bitechnologies.com/pdfs/p160.pdf
810p1C_MLCC_RES_DIP_5.5x3mm_P5mmC5VariousNPO10P10pF 16V ceramic capacitor. 5mm pitch resin dipped MLCC or similar.
9100k10RC07R6,R29,R28,R33,R30,R18,R9,R34,R35,R20VariousMR25100K100k 250mW Metal Film 2% or better.
10SWITCH_SPDT2HDR1X3SW2,SW3Just 3 off PTHSW057SPDT switch wired to holes in PCB.
1110k_LIN1POT_BITech-TTE_P160KNRV4VariousVR00410k Lin pot. PCB mount like: http://www.bitechnologies.com/pdfs/p160.pdf
12BC5571BC557Q8BC557BQD013BC557 PNP BJT in TO-92 package.
13DNF_51k1RC07R10VariousDO NOT FIT IF SW2 AND LFO PARTS FITTED (10k 250mW Metal Film 2% or better.)
14SWITCH_DPDT1HDR1X6SW1Just 6 off PTH.SW035DPDT switch wired to holes in PCB.
1547n6C_MLCC_RES_DIP_5.5x3mm_P5mmC17,C24,C8,C2,C18,C14VariousCC00347nF 16V ceramic capacitor. 5mm pitch resin dipped MLCC or similar.
1610R3RC07R22,R13,R25VariousMR2510R10R 250mW Metal Film 2% or better.
17100k_LOG2POT_BITech-TTE_P160KNRV6,RV7VariousVR085100k Log pot. PCB mount like: http://www.bitechnologies.com/pdfs/p160.pdf
1822n1C_MLCC_RES_DIP_5.5x3mm_P5mmC19VariousCC00822nF 16V ceramic capacitor. 5mm pitch resin dipped MLCC or similar.
191u12C_ALUnTANT_D6n9mm_P1.5-5mmC11,C16,C10,C22,C15,C7,C6,C4,C3,C1,C12,C26VariousHC1U0631uF 16V electrolytic capacitor. 5mm pitch resin dipped tantalum or 1.5mm to 2.5mm aluminium.
20220u1C_ALUnTANT_D6n9mm_P1.5-5mmC20VariousLC220U35220uF 16V electrolytic capacitor. 5mm pitch resin dipped tantalum or 1.5mm to 2.5mm aluminium.
2147u5C_ALUnTANT_D6n9mm_P1.5-5mmC21,C23,C13,C27,C28VariousLC47U2547uF 16V electrolytic capacitor. 5mm pitch resin dipped tantalum or 1.5mm to 2.5mm aluminium.
22LED1LED3MMD1Any 3mm lead spacing LED. (Almost any LED can be fitted if the leads are bent or wired to the PCB)OP009Red 3mm LED with approx 2V forward drop.
2310k_LOG2POT_BITech-TTE_P160KNRV5,RV3VariousVR09910k Log pot. PCB mount like: http://www.bitechnologies.com/pdfs/p160.pdf
241k2RC07R23,R38VariousMR251K1k 250mW Metal Film 2% or better.
25SIP22HDR1X2P1,P2Just 2 off PTHWires can go straight to PCB.
26LM3861DIP08U2LM386N-3QU206LM386 low power audio amplifier in 8 pin DIP package.
276.35mm_switched_3_pole_jack_skt_w-mono_plug16.35mm_switched_3_pole_jack_skt_Neutrik_NMJ6HFD2SKT1Neutrik NMJ6HFD2 or similarCN0576.35mm switched 3 pole jack socket Neutrik NMJ6HFD2 showing use as power switch with mono plug.
286.35mm_switched_3_pole_jack_skt_Neutrik_NMJ6HFD216.35mm_switched_3_pole_jack_skt_Neutrik_NMJ6HFD2SKT2Neutrik NMJ6HFD2 or similarCN0576.35mm switched 3 pole jack socket Neutrik NMJ6HFD2.
29TL084N2DIP14U1,U3TL084CNQU111TL084 quad opamp in 14 pin DIP package.
30WIRE_LINK_or_SoT_CAP1C_MLCC_RES_DIP_5.5x3mm_P5mmC25Various-Wire link or user choice of capacitor.
31unplated_M3_clearance_hole4hole_3mm53M5_H1,3M5_H2,3M5_H3,3M5_H4n/aYou don't have to buy these: they come free with the PCB.

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